From 856a238daa5fb5358a917c58352d1618b2f9b602 Mon Sep 17 00:00:00 2001
From: George Fu <kuhe@users.noreply.github.com>
Date: Fri, 25 Nov 2022 16:07:25 -0500
Subject: [PATCH] fix(service): use service signatureVersion as default (#4284)

---
 lib/region_config.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/region_config.js b/lib/region_config.js
index f401383d7f..2e8d0de628 100644
--- a/lib/region_config.js
+++ b/lib/region_config.js
@@ -63,7 +63,9 @@ function configureEndpoint(service) {
       }
 
       // signature version
-      if (!config.signatureVersion) config.signatureVersion = 'v4';
+      if (!config.signatureVersion) {
+        config.signatureVersion = (service.api && service.api.signatureVersion) || 'v4';
+      }
 
       // merge config
       applyConfig(service, config);